DFI open/closed loop problems

[Bruce Plecan]

From: Zachary Zehnacker <zzehnack at stevens-tech.edu>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>

On Tue, 7 Apr 1998, Andris Skulte wrote:
>
>values just keeps the DFI from constantly switching back and forth between
open and closed loop like it would if there was only 1 RPM limit for closed
loop operation.  If my understanding is correct, your setup would have to go
up to 2000 RPM before closed loop operation would begin.  It would then stay
in closed loop until it dropped below 750 rpm.  If it did drop below 750 and
come out of closed loop it would then require the engine to reach 2000 RPM
again before going back into closed loop.  I hope
>someone will correct me if I am wrong in my understanding of these two
>limit settings.  The manual isn't very clear about them.
>
>   I also don't think I remember seeing anywhere that the DFI actually
>tells you that you are in open or closed loop.  The only way that I have
>found is to see if the oxygen sensor is correcting the mixture (on the
>'V' screen) or when the bar on the fuel map screen comes on to show you
>what your mixture would be if the unit were in open loop.
>
>   I think your 30 lb injectors might be the reason you are having to
>lean out the maps so much.  I think the stock maps are usually setup for
>18-20 lb injectors.
>
>        Zak

Also makes perfect sense for an open loop idle (for big cams), and to
prevent stalling on overrun..
Bruce